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Figure 1
Data sampling in ptychography. The specimen is illuminated by beam spots of diameter d with divergence [\theta_{{d}}], leading to an incident illumination diameter D on the detector. The desired half-period pixel width δ (the limit of resolution) implies a diffraction numerical aperture [\theta_{{\delta}}] out to the edges of the detector.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 5| September 2017| Pages 1078-1081
https://doi.org/10.1107/S1600577517009869
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